Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks

Sandstone and conglomerate, rarely forms prominent outcrops; massive conglomerate is typical near base of unit and locally in upper part. These deposits are nonmarine except in southeastern Arizona, where prominent gray marine limestone (Mural Limestone) forms the middle of the Bisbee Group. Sandstones are typically medium-bedded, drab brown, lithic-feldspathic arenites. Includes Bisbee Group (largely Early Cretaceous) and related rocks, Temporal, Bathtub, and Sand Wells formations, rocks of Gu Achi, McCoy Mountains Formation, and Upper Cretaceous Fort Crittenden Formation and equivalent rocks. (80-160 Ma)
State Arizona
Name Cretaceous to Late Jurassic sedimentary rocks with minor volcanic rocks
Geologic age Late Jurassic to Cretaceous
Lithologic constituents
Sedimentary > Clastic > Conglomerate (Bed)
Sedimentary > Clastic > Sandstone > Arenite (Bed)
Sedimentary > Carbonate > Limestone (Bed)
Stratigraphic units Bisbee Group, Temporal Formation, Bathtub Formation, Sand Wells Formation, Fort Crittenden Formation, McCoy Mountains Formation, rocks of Gu Achi

Richard, S.M., Reynolds, S.J., Spencer, J.E., and Pearthree, P.A., 2000, Geologic Map of Arizona: Arizona Geological Survey Map 35, 1 sheet, scale 1:1,000,000.

Dickinson, W.R., Fiorillo, A.R., Hall, D.L., Monreal, R., Potochnik, A.R., and Swift, P.M., 1989, Cretaceous strata of southern Arizona, in Jenney, J.P., and Reynolds, S.J., editors, Geologic evolution of Arizona: Arizona Geological Society

Tosdal R.M., Haxel, G.B., and Wright, J.E., 1989, Jurassic geology of the Sonoran Desert region, southern Arizona, southeastern California, and northernmost Sonora: Construction of a continental-margin magmatic arc, in Jenney, J.P., and Rey

NGMDB product
Counties Cochise - La Paz - Maricopa - Pima - Pinal - Santa Cruz - Yuma